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PDF AAT1500 Data sheet ( Hoja de datos )
| Número de pieza | AAT1500 | |
| Descripción | CONSTANT CURRENT BOOST CONVERTER FOR 1 TO 4 WHITE LEDS | |
| Fabricantes | AAT | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AAT1500 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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Advanced Analog Technology, Inc.
AAT1500
Product information presented is current as of publication date. Details are subject to change without notice
CONSTANT CURRENT BOOST CONVERTER
FOR 1 TO 4 WHITE LEDS
Features
General Description
z Up to 4 LEDs at 2.8V Supply
mz High Efficiency (85%)
oz Output Over Voltage Protection
.cz HV Internal Switch
z 1 MHz PWM Switching Frequency
Uz Uses Tiny 1 mm Height Inductor
t4z 2.6V to 6V Input Range
ez 0.1µA Shutdown Current
ez SOT-25, SOT-26 & VQFN-8
hPackage Available
The AAT1500 is a step-up converter that provides a
solution to drive 1 to 4 white LEDs with a constant
current from a Lithium Ion cell, and its switching
frequency is fixed at 1 MHz.
The AAT1500 offers a low 0.25V reference, which
minimizes power loss in the current setting resistor
and improves efficiency. Except in SOT-25 package,
protection features include output over voltage
protections. The AAT1500 consists of a 0.1µA
shutdown current, and HV internal switch. Input
supple range allows operation from 2.6V to 6V.
taSPin Configuration
TOP
aVIEW
.DSW 1
5 VDD SW
GND 2
GND
wIE 3
4 EN IE
TOP
VIEW
16
VDD
2 5 OVP
3 4 EN
wSOT- 25 PACKAGE SOT- 26 PACKAGE
w TOP
VIEW
omOVP 1
8 SW
.cVDD 2
7 GND1
t4UEN 3
6 IE
eGND 4
5 NC
The AAT1500 is available in 5-pin SOT-25, 6-pin
SOT-26 and 8-pin VQFN-8 package.
Applications
z Palmtops
z MP3 Player
z Digital Still Cameras
z Portable Media Player
z Cell Phones and Smart Phones
z Electronic Information Organizers
SheVQFN-8 PACKAGE
ata– –
.D– Advanced Analog Technology, Inc. –
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Advanced Analog Technology, Inc.
AAT1500
Frequency vs. Temperature
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
-40 -20
0
20 40 60 80 100
Temperature ( )
Dimming Control Typical Application
Vin : 2.6V~5.5V
D1 L1 4.7µH
C2
10µF
D2
LED
D3
LED
D4
LED
R2 6.8kΩ
AAT1500
1 SW VDD 6
2 GND OVP 5
3 IE
EN 4
R1
12.4Ω
R3
43kΩ
R4 10kΩ
Dimming Control
C3
0.1µF
Frequency : 800Hz~40kHz
C1
10µF
LED Current vs. Dimming Duty
25
20
15
10
5
0
10% 20% 30% 40% 50% 60% 70% 80% 90%
Dimming Duty
Efficiency vs. Dimming Frequency
90%
80%
70%
60%
3V
3.5V
4V
4.2V
50%
10% 20% 30% 40% 50% 60% 70% 80% 90%
Dimming Frequency : 20kHz
Efficiency vs. Dimming Frequency
90%
80%
2.8V
70% 3V
60%
3.5V
4V
4.2V
50%
10% 20% 30% 40% 50% 60% 70% 80% 90%
Dimming Frequency : 40kHz
Efficiency vs. Dimming Frequency
100%
90%
3.5V
80% 4V
4.2V
70% 3V
60% 2.8V
50%
10% 20% 30% 40% 50% 60% 70% 80% 90%
Dimming Frequency : 800Hz
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– Advanced Analog Technology, Inc. –
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Advanced Analog Technology, Inc.
AAT1500
Package Dimensions
SOT-25(Cont.)
A
------
------
1.45
A1
------
------
0.15
A2 0.90 1.15 1.30
b 0.3 ------ 0.5
c 0.08 ------ 0.22
D 2.90 BSC
E 2.80 BSC
E1 1.60 BSC
e 0.95 BSC
e1 1.90 BSC
L 0.30 0.45 0.60
L1 0.60 REF
L2 0.25 BSC
R
0.1
------
------
R1 0.10 ------ 0.25
θ 048
θ1 5 10 15
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– Advanced Analog Technology, Inc. –
Page 11 of 17
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11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AAT1500.PDF ] | |
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